[Coco] How Many OR90s can be utilized?

Zippster zippster278 at gmail.com
Sat Nov 12 14:13:47 EST 2016

> On Nov 12, 2016, at 12:59 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> I can also see Zippster producing a batch of Orch90 carts, and someone wanting to run one of those with CocoFLASH, using both at the same time.  If Zippster has some extra space in his CPLD, it's a small item to add the capability.

Will be doing at least one small run when I’m done building and sending out these mini-MPIs.

Plenty of room in the CPLD. I’ll take a look at adding some features, start off with Orch90 default address with programmable addressing
(user can set it) as an option perhaps.

> I also see it as incongruous to offer a ROM cart that has lots of flexibility, alongside an OR90 capability that has no flexibility...
> To answer your question, it seems reasonable that someone would want to attempt quadraphonic sounds using 2+ units.  I think TANDY already offered the SOUND/SPEECH pak and the ORCH90 pak in different IO addresses assuming someone would pair them for some use.
> The difficult part here:  Once the devices leave my hands, it will be difficult to add features.  So, I have to add them now, before they are utilized.  Thus, I am trying to think ahead, to see if it is reasonable to expect someone will want the capability.
> To my original question:  Anyone know how heavily the CPU is loaded when playing OR90 samples?

It would depend on the sample rate.  I think you could probably run 4 DACs (2 orch 90s) at 22KHz without much issue,
more than that and it would probably be time to look closer at the cycles needed.

- Ed

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